If you're saying you still want to keep the tank divided and get a fish other than a betta, I would not suggest cories or otos. Otos, cories, and ADFs all like to be kept with members of their own species. One section of a ten gallon would also not be enough horizontal space for any of these fish. I suggest simply getting another betta or opening up the section so one of your boys has more space. If you opened up a section so that it was ~6.7 gallons, I could see potentially getting two ADFs--but you said you hadn't been able to find them, sadly.
Last edited by Adastra; 06-25-2010 at 01:02 PM.